Coil and method of winding and processing same



Nov. 13, 1962 E. v. CAMMAUF COIL AND METHOD OF WINDING AND PROCESSINGSAME Filed March 25. 1957 FIG. 2

FIG.3

INVENTOR ESTHER V. CAMMAUF ATTORNEY United States Patent 3,063,136 COILAND METHOD OF WINDING AND PROCESSING SAME Esther V. Cammauf, Lititz,Pa., assignor to Hamilton Watch Company, Lancaster, Pa., a corporationof Pennsylvania Filed Mar. 25, 1957, Ser. No. 648,379 5 Claims. (Cl.29155.57)

This invention relates to a coil and tothe method for winding andprocessing the same. v

In the manufacture of electric watches or other electrical instrumentswhich might use a very small coil the difiiculty of winding such a coiland processing it to where it can be handled without destroying itsfunction is considerably increased because of the fineness of wire used.

In a coil such as that disclosed in the invention, the diameter of thewire is approximately .0006" or about onesixth the thickness of a humanhair. Because of this ex treme smallness, the winding of the coilcreates problems which are entirely different from those experienced inthe handling of coils made from wire of larger diameter. 7

It is the object of the present invention to provide a method of windingthese coils whereby they may be handled without destroying theinsulation or without breaking the wire of the coil.

It is a still further object of the present invention to provide meansfor protecting the coil during the winding operation and forfacilitating the handling of the coil.

The present invention is illustrated in the accompanying drawing inwhich:

FIGURE 1 is an end view showing the coil mounted on one-half of thewinding spindle.

FIGURE 2 is a longitudinal cross section through the winding spindle.

FIGURE 3 is a top plan view of the press supporting a plurality ofcoils.

Referring particularly to FIGURES l and 2, a winding spindle formed oftwo separate parts 8 and 10 is connected together with a pair of pressfitted pins 12 and 14. The halves of the spindle 8 and 10 are mountedfor rotation in a coil winding machine (not shown). This machine may beany one of a number of different types of coil winding machines inpresent day use.

The ends of the spindle halves 8 and 10 are formed with wedge shapedprojections 16 and 18 which conform to the shape of the coil desired andupon which the wire of the coil is wound. By abutting the projections 16and 18 the annular groove 20 is formed by the spindles 8 and 10 forreceiving the windings so as to form the coil 24.

A ring or sleeve 26 which is formed preferably of a non-adhesiveplastic, such as Teflon, and conforming in shape to the projections 16and 18, is slipped over one of the projections before they are broughttogether. The other projection slips into the ring 26 to form a core forthe coil 24. A washer 28 formed of a similar plastic material is carriedon one end of the spindle and serves as an abutment for one end of thecoil.

In the making of the coil 24, the spindles 8 and 10 are inserted in awinding machine (not shown), the plastic washer 28 and ring 26 arepositioned in place and a predetermined number of turns of wire arewrapped on the ring 26 in the annular groove 20. During the windingprocess the wire is coated with a resin adhesive in a con-. ventionalmethod.

After the completion of the winding operation, the spindles 8 and 10 aredrawn apart from each other and the ring 26 and Washer 28 with the coilwindings thereon are removed for finishing purposes,

A plurality of coils are then mounted on a bolt (see FIG. 3) having across-sectional area similar to the projections ice The invention may beembodied in other specific forms without departing from the spirit oressential characteristics thereof. The present embodiment is thereforeto be considered in all respects as illustrative and not restrictive,the scope of the invention being indicated by the appended claims ratherthan by the foregoing description and all changes which come withinthe'meaning and range of equivalency of the claims are thereforeintended to be embraced therein.

What is claimed and desired to be secured by the United States LettersPatent is:

1. A method of fabricating coils comprising: providing a rigid annularring; providing a washer whose inner surface abuts an axial end of saidring to form a flange extending radially outwardly from said ring;providing a surface abutting the other axial end of said ring and in aplane substantially parallel to said flange; winding a wire about saidring and between said flange and said surface to form a coil; coatingsaid wire with an adhesive material during the winding operation; saidwasher being formed of a material which will not adhere to said wire bymeans of said adhesive material; removing said surface from said otheraxial end of the ring; placing a plurality of coils prepared as abovestated on a common support element passing centrally through each coil;the washer of each coil being remote from the washer of each adjacentcoil; placing said plurality of coils under axial pressure; the rigidityof each ring preventing the axial compression of the wire coil woundabout it to an axial thickness less than the length of said ring; andbaking said plurality of coils sufficiently to set said adhesive.

2. The method recited in claim 1 wherein: said ring is mounted on atwo-piece support during the winding operation; one piece of saidtwo-piece support having a portion against which said washer lies and aprojection extending into the central portion of said ring; the otherpiece of said two-piece support providing the surface abutting the otheraxial end of said ring; and removing said coil from said two-piecesupport after the winding operation by means of said Washer after saidother piece of said two-piece support has been drawn away from saidring.

3. The method recited in claim 2 additionally comprising: providingmeans for maintaining the two pieces of said two-piece support inalignment during the winding operation.

4. A method of fabricating coils comprising: providing a two-piecesupport; the first of said pieces having a washer-supporting surface anda projection located centrally of said washer-supporting surface; thesecond of said pieces having a surface matable with said projection anda second surface surrounding said matable surface; placing a washerabout said projection and against said washer-supporting surface;placing a ring about said projection so that the inner periphery of saidwasher abuts an axial end of said ring and said washer presents a flangesurface extending radially outward from said axial end of said ring;moving the second of said pieces towards the first of said pieces sothat the matable surface on the former abuts and mates with theprojection on the latter and the second surface on the former liesparallel with said flange surface and removed therefrom; winding 2. wireabout said ring and between said flange and said second surface; coatingsaid wire with an adhesive material during the winding operation; saidwasher being formed of a material which will not adhere to said wire bymeans of said adhesive material; removing said second piece from saidfirst piece and removing said coil from said first piece by means ofsaid washer; placing a plurality of coils prepared as above stated on acommon support element passing centrally through each coil; the washerof each coil being remote from the washer of each adjacent coil but inabutting relationship to the ring of said adjacent coil and baking saidplurality of coils sufficiently to set said adhesive.

5. The method defined in claim 4 wherein said matable surface of saidsecond piece projects outwardly from said second surface and whereinsaid projecting matable surface extends into said ring during thewinding operation.

References Cited in the file of this patent UNITED STATES PATENTS838,423 Kitsce Dec. 11, 1906 4 Pfanstiehl Aug. 13, Bastian Sept. 28,Peterson Feb. 26, Calabrese Mar. 5, Apple Jan. 3, Theme Mar. 12,Leavenworth Aug. 26, Robinson June 6, Cahill Nov. 6,

Livera -2. Mar. 22, Prickett July 11, Hunt May 6, Coggeshall et al July21, Steigerwalt Aug. 30, Aske Jan. 13, Wohlhiester Mar. 22, Ford June21, Zimsky Sept. 13,

